Abstract:
The experiment was conducted at the Agronomy Field, Sher-e-l3angla Agricultural
University. Ohaka from June to November 2007 to evaluate the effect of nitrogen
sources and spacing on the growth and yield of
T-a,nan rice of BRRJ dhan 31. The
experiment comprised of three nitrogen sources
viz. prilled urea (PU). Urea super
granules (USC) and foliar application of area, and five spacing viz. 15 cm
20cm
x
15 cm, 25cm
x
lS cm, 3Ocm
x
l5cm and 35 cmx IS em.Theexperiment
was laid out in a split plot design with three replications assigning nitrogen sources in
the main plot and spacing in the sub-plots. Nitrogen sources significantly changed all
growth characters and yield attributes except I 000-grain weight. The highest plant
height (105.70cm at harvest), number of tillers hill"
(11.03 at 60 DAT), di7' weight
plant' (101.95 g at harvest) were obtained from IJSG. The maximum grain yield (4.58
ha") was obtained from USC. which was attributed of higher number of effective
tillers hillt (7.55),
the highest number of filled grains panicle" (92.60) and highest
panicle length (26.19 cm). The minimum grain yield (3.53 t ha") was obtained from
foliar application of urea. The effect of spacing was significant for all the crop
characters except 1000-grain weight. Plant height, number of tillers hill
1
, dry weight
plant", effective tillers hill'. straw yield and biological yield were higher with widest
spacing
(35 cm
x
15 cm). But number of filled grains panicle" (102.2), panicle length
(27.17cm), grain yield (4.76 t ha") and harvest index
(45.97%) were maximum in 25
cm
x
IS cm spacing. The interaction between nitrogen sources and plant spacing had
significant effect of crop characters except 1000-grain weight. Plant height, number of
tillers hill" and dry weight showed higher with the interaction of uSC and 35cm
cm spacing. Number of effcctive tillers hill"
. number of filled grains panicle", panicle
length, grain yield, biological yield and harvest index were found highest with the
combination effect of USC and 25 cm
x IS cm spacing. On the other hand, lowest
grain yield and straw yield was obtained from the interactions effect of foliar urea
with 35cm
x
15 cm spacing and USC with 15 cm
x
15 cm spacing, respectively.
